javascript - AngularJS - Json 到树结构

Question

我见过很多将 Json 响应转换为 Ul 树结构的答案。问题是所有这些主题都围绕着一个嵌套的响应指向找出父对象和子对象之间的关系。

我有一个非嵌套的 Json 响应，通过引用对象属性来指示关系。

以下为部分回复内容:

{"id":"1","parent_id":null,"name":"Item-0"}, {"id":"2","parent_id":"1","name":"Item-1"}, {"id":"3","parent_id":"2","name":"Item-2"}, {"id":"4","parent_id":"2","name":"Item-4"}, {"id":"5","parent_id":"2","name":"Item-5"}, {"id":"6","parent_id":"2","name":"Item-6"}, {"id":"7","parent_id":"2","name":"Item-7"}, {"id":"8","parent_id":"2","name":"Item-8"}, {"id":"9","parent_id":"2","name":"Item-9"}, {"id":"10","parent_id":"1","name":"Item-3"}, {"id":"11","parent_id":"10","name":"Item-10"},

您可能已经注意到，每个对象都通过连接到其父 ID 的 parent_id 与其父亲连接。

我尝试创建一个自定义指令来读取响应并通过递归构建树结构。

到目前为止，我只成功创建了树的第一层。 Demo

app.directive('tree',function(){
    var treeStructure = {
        restrict: "E",
        transclude: true,
        root:{
            response : "=src",
            Parent : "=parent"
        },
        link: function(scope, element, attrs){
            var log = [];
            scope.recursion = "";
            angular.forEach(scope.response, function(value, key) {
                if(value.parent_id == scope.Parent){
                    this.push(value);
                }
            }, log);
            scope.filteredItems = log;

            scope.getLength = function (id){
                var test = [];
                angular.forEach(scope.response, function(value, key) {
                    if(value.parent_id == id){
                        this.push(value);
                    }
                }, test);
                if(test.length > 0){
                    scope.recursion = '<tree src="scope.response" parent="'+id+'"></tree>';
                }
                return scope.recursion;
            };
        },
        template:
            '<ul>'
                +'<li ng-repeat="item in filteredItems">'
                    +'{{item.name}}<br />'
                    +'{{getLength(item.id)}}'
                +'</li>'
            +'<ul>'
    };
    return treeStructure;
});

app.controller('jManajer', function($scope){
    $scope.information = {
        legend : "Angular controlled JSon response",
    };

    $scope.response = [
        {"id":"1","parent_id":null,"name":"Item-0"},
        {"id":"2","parent_id":"1","name":"Item-1"},
        {"id":"3","parent_id":"2","name":"Item-3"},
        {"id":"4","parent_id":"2","name":"Item-4"},
        {"id":"5","parent_id":"2","name":"Item-5"},
        {"id":"6","parent_id":"2","name":"Item-6"},
        {"id":"7","parent_id":"2","name":"Item-7"},
        {"id":"8","parent_id":"2","name":"Item-8"},
        {"id":"9","parent_id":"2","name":"Item-9"},
        {"id":"10","parent_id":"1","name":"Item-2"},
        {"id":"11","parent_id":"10","name":"Item-10"},
    ];
});

有没有人可以告诉我如何通过递归将这种数组转换为树结构？

Answer 1

首先在嵌套数组中递归转换数组

var myApp = angular.module('myApp', []);

myApp.controller('jManajer', function($scope) {
  $scope.res = [];
  $scope.response = [{
    "id": "1",
    "parent_id": 0,
    "name": "Item-0"
  }, {
    "id": "2",
    "parent_id": "1",
    "name": "Item-1"
  }, {
    "id": "3",
    "parent_id": "2",
    "name": "Item-3"
  }, {
    "id": "4",
    "parent_id": "2",
    "name": "Item-4"
  }, {
    "id": "5",
    "parent_id": "2",
    "name": "Item-5"
  }, {
    "id": "6",
    "parent_id": "2",
    "name": "Item-6"
  }, {
    "id": "7",
    "parent_id": "2",
    "name": "Item-7"
  }, {
    "id": "8",
    "parent_id": "2",
    "name": "Item-8"
  }, {
    "id": "9",
    "parent_id": "2",
    "name": "Item-9"
  }, {
    "id": "10",
    "parent_id": "1",
    "name": "Item-2"
  }, {
    "id": "11",
    "parent_id": "10",
    "name": "Item-10"
  }, ];

  function getNestedChildren(arr, parent) {
    var out = []
    for (var i in arr) {
      if (arr[i].parent_id == parent) {
        var children = getNestedChildren(arr, arr[i].id)

        if (children.length) {
          arr[i].children = children
        }
        out.push(arr[i])
      }
    }
    return out
  }
  $scope.res = getNestedChildren($scope.response, "0");

  console.log($scope.res);
  $scope.nested_array_stingified = JSON.stringify($scope.res);

});

<!DOCTYPE html>
<html>

<head>
  <script src="https://code.angularjs.org/1.3.11/angular.js"></script>

</head>

<body ng-app="myApp" ng-controller="jManajer">

  {{nested_array_stingified}}
</body>

</html>

之后您可以按照此处的教程进行操作，例如 http://sporto.github.io/blog/2013/06/24/nested-recursive-directives-in-angular/